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<title>Parser Directive Inhibiting Case Sensitivity (no_case[])</title>
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<div class="titlepage"><div><div><h5 class="title">
<a name="spirit.qi.reference.directive.no_case"></a><a class="link" href="no_case.html" title="Parser Directive Inhibiting Case Sensitivity (no_case[])">Parser Directive
          Inhibiting Case Sensitivity (<code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code>)</a>
</h5></div></div></div>
<h6>
<a name="spirit.qi.reference.directive.no_case.h0"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.description"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.description">Description</a>
          </h6>
<p>
            The <code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code>
            directive does not consume any input. The actual matching is done by
            its subject parser. It's purpose is to force matching of the subject
            parser (and all its children) to be case insensitive.
          </p>
<h6>
<a name="spirit.qi.reference.directive.no_case.h1"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.header"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.header">Header</a>
          </h6>
<pre class="programlisting"><span class="comment">// forwards to &lt;boost/spirit/home/qi/directive/no_case.hpp&gt;</span>
<span class="preprocessor">#include</span> <span class="special">&lt;</span><span class="identifier">boost</span><span class="special">/</span><span class="identifier">spirit</span><span class="special">/</span><span class="identifier">include</span><span class="special">/</span><span class="identifier">qi_no_case</span><span class="special">.</span><span class="identifier">hpp</span><span class="special">&gt;</span>
</pre>
<p>
            Also, see <a class="link" href="../../../structure/include.html" title="Include">Include Structure</a>.
          </p>
<h6>
<a name="spirit.qi.reference.directive.no_case.h2"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.namespace"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.namespace">Namespace</a>
          </h6>
<div class="informaltable"><table class="table">
<colgroup><col></colgroup>
<thead><tr><th>
                    <p>
                      Name
                    </p>
                  </th></tr></thead>
<tbody><tr><td>
                    <p>
                      <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span></code>
                    </p>
                  </td></tr></tbody>
</table></div>
<p>
            In the table above, <code class="computeroutput"><span class="identifier">ns</span></code>
            represents a <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character
            Encoding Namespace</a>.
          </p>
<h6>
<a name="spirit.qi.reference.directive.no_case.h3"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.model_of"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.model_of">Model
            of</a>
          </h6>
<p>
            The model of <code class="computeroutput"><span class="identifier">no_case</span></code>
            is the model of its subject parser.
          </p>
<div class="variablelist">
<p class="title"><b>Notation</b></p>
<dl class="variablelist">
<dt><span class="term"><code class="computeroutput"><span class="identifier">a</span></code></span></dt>
<dd><p>
                  A <a class="link" href="../parser_concepts/parser.html" title="Parser"><code class="computeroutput"><span class="identifier">Parser</span></code></a>.
                </p></dd>
<dt><span class="term"><code class="computeroutput"><span class="identifier">ns</span></code></span></dt>
<dd><p>
                  A <a class="link" href="../basics.html#spirit.qi.reference.basics.character_encoding_namespace">Character
                  Encoding Namespace</a>.
                </p></dd>
</dl>
</div>
<h6>
<a name="spirit.qi.reference.directive.no_case.h4"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.expression_semantics"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.expression_semantics">Expression
            Semantics</a>
          </h6>
<p>
            Semantics of an expression is defined only where it differs from, or
            is not defined in the subject's concept.
          </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Expression
                    </p>
                  </th>
<th>
                    <p>
                      Semantics
                    </p>
                  </th>
</tr></thead>
<tbody><tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code>
                    </p>
                  </td>
<td>
                    <p>
                      Force matching of the subject parser, <code class="computeroutput"><span class="identifier">a</span></code>
                      (and all its children) to be case insensitive
                    </p>
                  </td>
</tr></tbody>
</table></div>
<h6>
<a name="spirit.qi.reference.directive.no_case.h5"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.attributes"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.attributes">Attributes</a>
          </h6>
<p>
            See <a class="link" href="../../quick_reference/compound_attribute_rules.html#spirit.qi.quick_reference.compound_attribute_rules.notation">Compound
            Attribute Notation</a>.
          </p>
<div class="informaltable"><table class="table">
<colgroup>
<col>
<col>
</colgroup>
<thead><tr>
<th>
                    <p>
                      Expression
                    </p>
                  </th>
<th>
                    <p>
                      Attribute
                    </p>
                  </th>
</tr></thead>
<tbody><tr>
<td>
                    <p>
                      <code class="computeroutput"><span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]</span></code>
                    </p>
                  </td>
<td>
                    <p>
</p>
<pre xmlns:rev="http://www.cs.rpi.edu/~gregod/boost/tools/doc/revision" class="table-programlisting"><span class="identifier">a</span><span class="special">:</span> <span class="identifier">A</span> <span class="special">--&gt;</span> <span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">A</span>
<span class="identifier">a</span><span class="special">:</span> <span class="identifier">Unused</span> <span class="special">--&gt;</span> <span class="identifier">ns</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">[</span><span class="identifier">a</span><span class="special">]:</span> <span class="identifier">Unused</span></pre>
<p>
                    </p>
                  </td>
</tr></tbody>
</table></div>
<h6>
<a name="spirit.qi.reference.directive.no_case.h6"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.complexity"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.complexity">Complexity</a>
          </h6>
<div class="blockquote"><blockquote class="blockquote"><p>
              The complexity is defined by the complexity of the subject parser,
              <code class="computeroutput"><span class="identifier">a</span></code>
            </p></blockquote></div>
<h6>
<a name="spirit.qi.reference.directive.no_case.h7"></a>
            <span class="phrase"><a name="spirit.qi.reference.directive.no_case.example"></a></span><a class="link" href="no_case.html#spirit.qi.reference.directive.no_case.example">Example</a>
          </h6>
<div class="note"><table border="0" summary="Note">
<tr>
<td rowspan="2" align="center" valign="top" width="25"><img alt="[Note]" src="../../../../images/note.png"></td>
<th align="left">Note</th>
</tr>
<tr><td align="left" valign="top"><p>
              The test harness for the example(s) below is presented in the <a class="link" href="../basics.html#spirit.qi.reference.basics.examples">Basics Examples</a>
              section.
            </p></td></tr>
</table></div>
<p>
            Some using declarations:
          </p>
<p>
</p>
<pre class="programlisting"><span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">no_case</span><span class="special">;</span>
<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">char_</span><span class="special">;</span>
<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">ascii</span><span class="special">::</span><span class="identifier">alnum</span><span class="special">;</span>
<span class="keyword">using</span> <span class="identifier">boost</span><span class="special">::</span><span class="identifier">spirit</span><span class="special">::</span><span class="identifier">qi</span><span class="special">::</span><span class="identifier">symbols</span><span class="special">;</span>
</pre>
<p>
          </p>
<p>
            Simple usage of <code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code>:
          </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">test_parser</span><span class="special">(</span><span class="string">"X"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span><span class="identifier">char_</span><span class="special">(</span><span class="char">'x'</span><span class="special">)]);</span>
<span class="identifier">test_parser</span><span class="special">(</span><span class="string">"6"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span><span class="identifier">alnum</span><span class="special">]);</span>
</pre>
<p>
          </p>
<p>
            A more sophisticated use case of <code class="computeroutput"><span class="identifier">no_case</span><span class="special">[]</span></code> in conjunction with a symbol table
            (see <a class="link" href="../string/symbols.html" title="Symbols Parser (symbols)"><code class="computeroutput"><span class="identifier">symbols</span><span class="special">&lt;&gt;</span></code></a>
            for more details):
          </p>
<p>
</p>
<pre class="programlisting"><span class="identifier">symbols</span><span class="special">&lt;</span><span class="keyword">char</span><span class="special">,</span> <span class="keyword">int</span><span class="special">&gt;</span> <span class="identifier">sym</span><span class="special">;</span>

<span class="identifier">sym</span><span class="special">.</span><span class="identifier">add</span>
    <span class="special">(</span><span class="string">"apple"</span><span class="special">,</span> <span class="number">1</span><span class="special">)</span>    <span class="comment">// symbol strings are added in lowercase...</span>
    <span class="special">(</span><span class="string">"banana"</span><span class="special">,</span> <span class="number">2</span><span class="special">)</span>
    <span class="special">(</span><span class="string">"orange"</span><span class="special">,</span> <span class="number">3</span><span class="special">)</span>
<span class="special">;</span>

<span class="keyword">int</span> <span class="identifier">i</span><span class="special">;</span>
<span class="comment">// ...because sym is used for case-insensitive parsing</span>
<span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"Apple"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span> <span class="identifier">sym</span> <span class="special">],</span> <span class="identifier">i</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">i</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
<span class="identifier">test_parser_attr</span><span class="special">(</span><span class="string">"ORANGE"</span><span class="special">,</span> <span class="identifier">no_case</span><span class="special">[</span> <span class="identifier">sym</span> <span class="special">],</span> <span class="identifier">i</span><span class="special">);</span>
<span class="identifier">std</span><span class="special">::</span><span class="identifier">cout</span> <span class="special">&lt;&lt;</span> <span class="identifier">i</span> <span class="special">&lt;&lt;</span> <span class="identifier">std</span><span class="special">::</span><span class="identifier">endl</span><span class="special">;</span>
</pre>
<p>
          </p>
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<td align="right"><div class="copyright-footer">Copyright © 2001-2011 Joel de Guzman, Hartmut Kaiser<p>
        Distributed under the Boost Software License, Version 1.0. (See accompanying
        file LICENSE_1_0.txt or copy at <a href="http://www.boost.org/LICENSE_1_0.txt" target="_top">http://www.boost.org/LICENSE_1_0.txt</a>)
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